In the geometry package, a line means a ``straight line''. It is unlimited in extent, i.e., it may be extended in either direction indefinitely.

A line l can be defined as follows:

from two given points A and B

from its algebraic representation eqn. I.e., eqn is a polynomial or an equation. If the third optional argument is not given, then:

if names are assigned to the two environment variables _EnvHorizontalName and _EnvVerticalName, then these two names will be used as the names of the horizontal-axis and vertical-axis respectively.

otherwise, Maple will prompt the user to input the names of the axes.

To access the information relating to a line l, use the following function calls:

The command with(geometry,line) allows the use of the abbreviated form of this command.